body{
    background: #f2f4f8;
}
/* 导航栏部分 */
.yf_head {
    height: 92PX;
    background: #0f0f0f;
    padding: 20PX;
}

.yf_ul {
    font-size: 20px;
    margin: 0 20px 0 20px;

}

.yf_ul:hover {
    background: #444444;
}

.yf_ul li a {
    color: #fff;
    font-weight: 500;
}
@font-face {
    font-family: 'iconfont';  /* project id 707355 */
    src: url('https://at.alicdn.com/t/font_707355_0mrqdle6pxb.eot');
    src: url('https://at.alicdn.com/t/font_707355_0mrqdle6pxb.eot?#iefix') format('embedded-opentype'),
    url('https://at.alicdn.com/t/font_707355_0mrqdle6pxb.woff') format('woff'),
    url('https://at.alicdn.com/t/font_707355_0mrqdle6pxb.ttf') format('truetype'),
    url('https://at.alicdn.com/t/font_707355_0mrqdle6pxb.svg#iconfont') format('svg');
  }

  .iconfont{
    font-family:"iconfont" !important;
    font-size:16px;font-style:normal;
    -webkit-font-smoothing: antialiased;
    -webkit-text-stroke-width: 0.2px;
    -moz-osx-font-smoothing: grayscale;}

/* 主内容部分 */
.yf_main{
    box-sizing: border-box;
}
.container{
    width: 1170px;
    height: 564px;
    border: 1px solid red ;
}
.yf_left{
    width: 197px;
    background: #aabbcc;
    height: 564px;
    margin: 0;
    position: relative;

}
.yf_img{
    width: 100px;
    height: 100px;
    margin: 46px;
    position: fixed;
}
.yf_message{
    width: 197px;
    height: 180px;
    background: #aeaeae;
    margin-top: 199px;
    position: fixed;
}